dynamic effect of rotating / vibrating equipment
dynamic effect of rotating / vibrating equipment
(OP)
fellows,
I would like to ask if the propeller-like at the bottom of the equipment (attached in this thread) should be considered in designing the platform shown in the picture?
Do you have any guideline how to consider vibration in design?
Happy Holidays
Regards,
AlphaXY
I would like to ask if the propeller-like at the bottom of the equipment (attached in this thread) should be considered in designing the platform shown in the picture?
Do you have any guideline how to consider vibration in design?
Happy Holidays
Regards,
AlphaXY






RE: dynamic effect of rotating / vibrating equipment
Maximum forces exerted in 3 axes and perhaps a number of equivalent cycles may be the way to go, since it is that it is quite unlikely that having proper fasteners to a relatively thick reinforced concrete plate may exert damage elsewhere ... I mean, the reaction points themselves are the critical ones and where to fix your attention, the damage will happen there first.
RE: dynamic effect of rotating / vibrating equipment
You can also calculate this yourself from the following formula:
F = Rotor Weight * eccentricity of rotor weight* Machine Speed^2 / 12g
The reference I am pulling this from may be using a unit specific formula. So:
Rotor weight (kips)
eccentricity (inches)
Machine Speed (radians per second)
gravity = 32.2 ft / sec^2
RE: dynamic effect of rotating / vibrating equipment
Guessing from the photo, probably not a structural problem, may be a noise problem.
Cheers
Greg Locock
I rarely exceed 1.79 x 10^12 furlongs per fortnight
RE: dynamic effect of rotating / vibrating equipment
What we also do is provide a Revit model to a subconsultant of ours with the bay in question, and all adjacent bays. The model will typically included all slabs, beams, girders, columns, floor openings/penetrations, and anything else that is relevant to the dynamic properties of the floor system.
Other information we provide to the subconsultant are:
frequency of the rotating equipment
mass of what is being rotated/vibrated
the axis about which it's being rotated
the centroid of the rotating mass from the axis of rotation
the centroid of the rotating mass from the floor
the location of the rotating mass in plan
the locations (in plan) where sensitive equipment is located
With this information, our subconsultant meshes the structure, making a FE model and has software that will give the acceleration, peak velocity, and frequency at any point on the structure.
We use that information to compare to the criteria for the existing equipment that could be impacted by the new, vibrating/rotating machine.